Astronomers have found the center of the Universe to be located in
a. Earth
b. the Sun
c. Sagittarius A
d. the Virgo Cluster of galaxies
e. no center is thought to exist.
e
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A galvanometer with a resistance of 40.0 ? deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?
A) 25 k? B) 27 k? C) 29 k? D) 31 k? E) 35 k?
Which of the following best describes the orbital resonance shared by Io, Europa, and Ganymede?
A) Io completes four orbits in the same time it takes Europa to complete two orbits and Ganymede to complete one orbit. B) Io, Europa, and Ganymede each have the same orbital period around Jupiter. C) Io, Europa, and Ganymede all show the same face to Jupiter at all times. D) Io, Europa, and Ganymede are always oriented in a straight line.
Which of the following cannot be determined from the spectrum of a star?
a. chemical composition b. surface temperature c. radial (along line of sight) velocity d. tangential (perpendicular to line of sight) velocity e. radial (along line of sight) velocity
What two observations allow us to calculate the Galaxy's mass?
A) the Sun's mass and velocity in orbit of the Galactic Center B) the Sun's age and period of the Galactic Year C) the Sun's orbital velocity and its distance from the Galactic Center D) the Sun's mass and its age E) the Sun's composition and luminosity